Sirdar / Hayfield - they have certificates for their 2 different factories,
please check the ball band for which certificate you
need. These cover the following yarns Supersoft Aran, Bonus DK, Bonus Chunky, Bonus Buzz DK, Baby Bonus DK and Baby Bonus 4 Ply.
It does not cover shades 930, 931 & 987 in Bonus DK and Bonus Chunky as these
have viscose neps.